10 Pack of 1" Female NPT Steel Pipe Coupling Unions Applications Include Compressed Air Systems, Industrial Applications, Grease, Fuels, refrigeration, instrumentation and hydraulic systems Zinc Plated Steel Construction. Max operating pressure 2000 PSI. Max Temp 375 Degrees Fahrenheit. Torque wrench and flat wrench installations are recommended. SAE recommends always making a wet (lubricated) installation or connection to reduce friction on moving parts. Both NPT and NPTF Tapered threads require thread tape or thread sealants to complete the seal. Zinc Plate Steel Hydraulic fittings can be used with Brass, bronze, aluminum and iron pipe. Steel hydraulic adapters are ideal in applications where the hydraulic system operates under moderate to high pressure and where the environment does not demand extreme corrosion resistance. Steel offers excellent strength and toughness, suitable for high-pressure hydraulic applications. Steel adapters are generally more affordable than those made from exotic materials like stainless steel or brass, offering a balance between performance and cost. When appropriately treated (e.G., zinc-plated or coated), steel can resist rust and corrosion, extending the lifespan of the fittings in various environments. Where to use steel hydraulic adapters: compressed air equipment and systems, air compressors, refrigerated air dryers. Industrial machinery: for connecting hoses or pipes in machinery where high pressure and durability are required. Construction equipment: in hydraulic systems of heavy equipment like excavators, loaders, where adapters need to withstand tough conditions. Automotive and agricultural vehicles: for hydraulic systems in vehicles or farming equipment, where adapters must handle hydraulic fluid under pressure without failing. Manufacturing plants: used in assembly lines or production setups where hydraulic power is used to drive tools or machinery. Hydraulic power units: in systems where hydraulic pumps, valves, and actuators are connected, ensuring seamless fluid flow and pressure distribution. Maintenance and repair: as replacements or for custom connections in existing hydraulic setups, where matching the original material strength is crucial.